837 セラミック遮熱コーティングの内部応力状態に対する界面の影響

概要

論文の詳細を見る
Influence of bond coat interface roughness to the internal residual stress of TBC prepared by thermal spray process was considered. Two kinds of samples to which surface roughness was changed were prepared. One has rough interface and the other has relatively smooth one. The internal residual stress measurement was carried out by using (sin)^2⩛ method with high energy X-rays (72keV) from synchrotron radiation of SPring-8. As for the X-ray diffraction profile, the diffraction peak of a bond coat was also detected, therefore the high energy X-rays had penetrated the ceramic layer. When interface roughness of a bond coat was large, residual stress was compressive, and when that is small, it was tensile. The residual stress is caused by the quenching from the molten droplet during thermal spray process and/or the thermal expansion mismatch between the ceramic top coat and the substrate. The difference of residual stress state was due to the difference in the adhesion strength of a ceramic layer and a bond coat.
社団法人日本機械学会の論文
2003-08-05